In this picture I am shrinking back the white some more and making a mistake on the right eye going to far and having to correct it.

Now I go back with white to fill in so I get back the amount of white area I want, as you learn to be more precise and making fewer mistakes it will look better and better.

Here I shrink it back again it might look pretty much the same as before but the camera doesn't pick up all the detail seen when painting, With this particular sculpt it was tougher than normal to paint the eyes.